A Fresnel lens can be used as a survival item because it can be used to start a fire. By focusing sunlight onto a small area, a Fresnel lens can generate enough heat to ignite dry tinder or kindling. This makes it a useful tool for outdoor enthusiasts, hikers, and campers who may need to start a fire in an emergency situation.

To use a Fresnel lens to start a fire, the user must hold the lens above the tinder or kindling, angling it until the sunlight is focused onto a small area. It may take a bit of practice to find the optimal distance and angle, but with some patience and persistence, the user should be able to generate enough heat to ignite the material.

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